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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2526
DTSTART:20120209T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T062534Z
LAST-MODIFIED:20120206T213417Z
LOCATION:4274 Chamberlin Hall
SUMMARY:The Empirical Case For 10 GeV Dark Matter\, NPAC (Nuclear/Part
 icle/Astro/Cosmo) Forum\, Dan Hooper\, Fermilab / University of Chicag
 o
DESCRIPTION:I will summarize and discuss the body of evidence which ha
 s accumulated in favor of dark matter in the form of approximately 10 
 GeV particles. This evidence includes the spectrum and angular distrib
 ution of gamma rays from the Galactic Center\, the synchrotron emissio
 n from the Milky Way's radio filaments\, the diffuse synchrotron emiss
 ion from the Inner Galaxy (the "WMAP Haze") and low-energy signals fro
 m the direct detection experiments DAMA/LIBRA\, CoGeNT and CRESST-II. 
 This collection of observations can be explained by a relatively light
  dark matter particle with an annihilation cross section consistent wi
 th that predicted for a simple thermal relic (sigma v ~ 10^-26 cm^3/s)
  and with a distribution in the halo of the Milky Way consistent with 
 that predicted from simulations. Astrophysical explanations for the ga
 mma ray and synchrotron signals\, in contrast\, have not been successf
 ul in accommodating these observations. Similarly\, the phase of the a
 nnual modulation observed by DAMA/LIBRA (and now supported by CoGeNT) 
 is inconsistent with all known or postulated modulating backgrounds\, 
 but are in good agreement with expectations for dark matter scattering
 . This scenario is consistent with all existing indirect and collider 
 constraints\, as well as the constraints placed by CDMS. Consistency w
 ith xenon-based experiments can be achieved if the response of liquid 
 xenon to very low-energy nuclear recoils is somewhat suppressed relati
 ve to previous evaluations\, or if the dark matter possesses different
  couplings to protons and neutrons.
URL:https://www.physics.wisc.edu/events/?id=2526
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